More like .73” @ 10 yds, or, the bore size of your trusty 12 gauge. Like shooting a slug gun. Which is why many folk are under the false assumption that they can just point that thing in the general direction of the bad guy and stop him cold, while the truth is that you are simply shooting a very large ‘rifle’ caliber @close range. The individual diameter of those 9 balls in a 00 12 gauge buckshot is much larger than .22, actually .33 caliber each! Those BIG holes you see shotgun nimrods blowing through doors and walls in the movies are pyrotechnics, not reality!
Also, 10 yards is, according to my old school math, 30 feet. If you are a ‘mansion’ type owner, you may have several areas inside that would give you that much distance - in my case, only my hallway all the way across my living room qualifies! Try making any rapid movements with a 30” weapon of any type inside your home(?), not an easy task. I also like the 12 for home defense; however, mine is compact, and I don’t plan on stalking the house with it....It is charged to repel boarders through a ‘locked’ door, once the lock is breeched!